*{
    margin: 0;
    padding: 0;
    border: 0;
}

body{
    width: 100%;
    font-size: 32px;
    color: #333;
}
.main{
    width: 1000px;
    height: 900px;
    margin: 20px auto;
}

/*头部样式*/
.main>header{
    width: 100%;

}
.main>header>div{
    text-align: center;
    width: 100%;
    padding-bottom: 20px;
}
.main>header>div>p:nth-child(1){
    font-size: 30px;
    line-height: 60px;
    color: #333;
}
.main>header>div>p:nth-child(2){
    font-size: 16px;
    color: #999;
}

/*导航栏样式*/
.main>nav{
    width: 100%;
    height: 40px;
}
.main>nav:after{
    content: "";
    display: block;
    clear: left;
}
.main>nav>.leftNav{
    width: 450px;
    float: left;
}
.main>nav>.leftNav>ul{
    text-align: center;
    list-style: none;
    width: 100%;
    height:36px;
}
.main>nav>.leftNav>ul>li{
    width: 76px;
    height: 36px;
    float: left;
    font-size: 14px;
    border-radius: 5px;
    line-height: 36px;
    margin: 0 4px;
}
.main>nav>.leftNav>ul>.selected{
    background-color: #0081e6;
}
.main>nav>.leftNav>ul>li:hover{
    background-color: #0081e6;
}
.main>nav>.rightNav{
    width: 140px;
    height: 36px;
    float: right;
}
.main>nav>.rightNav>ul{
    width: 100%;
    height: 36px;
    list-style: none;
}
.main>nav>.rightNav>ul:after{
    content: "";
    display: block;
    clear: left;
}

.main>nav>.rightNav>ul>li{
    float: left;
    width: 44px;
    font-size: 14px;
    background-color:  #f5f5f5;
    line-height: 36px;
    text-align: center;
    border: 1px solid #DFDFDF;
}
.main>nav>.rightNav>ul>li:hover{
    background-color: #e1e1e1;
}
.main>nav>.rightNav>ul>.selected2{
    background-color: #e1e1e1;
}
a{
    text-decoration: none;
    color:  #333;
}

/*课程列表样式*/
.main>article{
    width: 100px;
}
.main>article>ul:after{
    content: "";
    display: block;
    clear: left;
}
.main>article>ul{
    list-style: none;
    width: 1000px
}
.main>article>ul>li{
    width: 240px;
    height: 210px;
    float: left;
    margin: 10px 4px;
    /*background-color: #999999;*/
    border: 1px solid #DFDFDf;
    border-radius: 5px;
}
.main>article>ul>li>.block{
    display: block;
}
.main>article>ul>li>.none{
    display: none;
}
.main>article>ul>li>a>img{
    width: 240px;
    height: 150px;
    border-top-right-radius: 5px;
    border-top-left-radius: 5px;
}
.main>article>ul>li>.text{
    font-size: 13px;
    padding-left: 10px;
}
.main>article>ul>li>.xq{
    padding-top: 5px;
    height: 20px;
    width: 240px;
}
.main>article>ul>li>.xq>div:first-child{
    padding-left: 15px;
    font-size: 10px;
    height: 20px;
    float: left;
    padding-top: 0;
}
.main>article>ul>li>.xq>div:first-child>img{
    float: left;
}
.main>article>ul>li>.xq>div:last-child{
    float: right;
    font-size: 14px;
    padding-right: 8px;
    color: red;
}
span{
    display: block;
    float: left;
}